How do you search by post author? And can you specify between a reply and a post?
Well, the engine displays posts by the searched user first then it will display times when the users name is used in the post as well. I have tweeked the engine but it, unfortunatly, wont find every single reply by a user.
Also, the SD forum has a built in feature to find all posts created by a user. Click their name and select the last option in the dropdown menu.
I mainly created this engine as a way to determine if a post on a subject on which you wish to post already exists.